Drenia, an incubus from the demon realm, survives by recharging his energy through dream-sex and supplying it to the energy stations.
However, facing expulsion from the incubus society due to poor performance, his fellow succubus and old classmate, Mezinia, tempts him with a secret. She claims that sex with an actual human—rather than just in dreams—is the ultimate short-term, high-powered method of energy recharge. With that, she secretly sends Drenia to the human world.
Meanwhile, Jinsoo Park, once a promising rookie pro baseball player, is forced to retire after a sudden major injury. Now, he runs a small snack shop in front of Somang Women’s University. One day, he discovers Drenia collapsed outside his shop. From that fateful meeting, the two begin living together sparking a chain of endlessly sexy, wild, and tangled events…